Campaign contributions from oil industry executives to Sen. John McCain rose dramatically in the last half of June, after the senator from Arizona made a high-profile split with environmentalists and reversed his opposition to the federal ban on offshore drilling.

Oil and gas industry executives and employees donated $1.1 million to McCain last month — three-quarters of which came after his June 16 speech calling for an end to the ban — compared with $116,000 in March, $283,000 in April and $208,000 in May.